The patch titled
pageattr: cache flush before tlb flush
has been removed from the -mm tree. Its filename was
pageattr-cache-flush-before-tlb-flush.patch
This patch was dropped because it was nacked
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: pageattr: cache flush before tlb flush
From: Shaohua Li <shaohua.li@xxxxxxxxx>
clflush uses a virtual address but cache line is physical indexed in x86.
In my understanding, clflush will do some pagetable walk, so doing cache
flush first should reduce some pagetable walk.
Signed-off-by: Shaohua Li <shaohua.li@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/mm/pageattr.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff -puN arch/x86/mm/pageattr.c~pageattr-cache-flush-before-tlb-flush arch/x86/mm/pageattr.c
--- a/arch/x86/mm/pageattr.c~pageattr-cache-flush-before-tlb-flush
+++ a/arch/x86/mm/pageattr.c
@@ -168,10 +168,8 @@ static void cpa_flush_range(unsigned lon
BUG_ON(irqs_disabled());
WARN_ON(PAGE_ALIGN(start) != start);
- on_each_cpu(__cpa_flush_range, NULL, 1);
-
if (!cache)
- return;
+ goto tlb_flush;
/*
* We only need to flush on one CPU,
@@ -188,6 +186,9 @@ static void cpa_flush_range(unsigned lon
if (pte && (pte_val(*pte) & _PAGE_PRESENT))
clflush_cache_range((void *) addr, PAGE_SIZE);
}
+
+tlb_flush:
+ on_each_cpu(__cpa_flush_range, NULL, 1);
}
/*
_
Patches currently in -mm which might be from shaohua.li@xxxxxxxxx are
linux-next.patch
pageattr-cache-flush-before-tlb-flush.patch
rtc-cmos-strongly-avoid-hpet-emulation.patch
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